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OMemorand umO <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD • CENTRAL VALLEY REGION <br /> 3443 Routier Road Phone: (916) 361-5600 <br /> Sacramento, CA 95827-3098 ATSS: 8-495-5600 <br /> TO: Antonia Vorster If FROM: Gary A. Reents, P.E. PAYMENTD <br /> Senior Engineer Project Engineer RECEIVE <br /> JUN 1,7 1988 <br /> DATE: (A i(?S '✓ VIRONMENTAL CEAtTF <br /> 8 June 1988 SIGNATURE: EN (SERVICES <br /> SUBJECT: STORMWATER POND CLOSURE PLAN AND PHASE IV WORKPLAN, MARLEY COOLING <br /> TOWER, SAN JOAQUIN COUNTY <br /> Marley Cooling Tower Company (Marley) submitted an Interim Closure Plan, dated 17 <br /> May 1988, as part of their "Surface Impoundment Closure and Post-Closure Plan", <br /> dated 14 March 1988. Marley also submitted responses to comments supplied <br /> by the Department of Health Services (OFIS) and our office under DHS cover letter <br /> regarding the Phase IV Workplan dated 27 May 1988. All of Marley' s responses to <br /> our comments (Regional Board memorandum dated 8 April 1988) are acceptable and <br /> Phase IV investigation work should proceed. <br /> After review of the interim closure plan, we have determined that the proposal <br /> will meet TPCA requirements if the issues listed below are adequately resolved. <br /> TPCA cease dishcarge requirements will be met since all free liquids have or will <br /> be removed from the pond and the proposal should prevent future contact of liquids <br /> with any wastes left in place. Additionally, the pond closure is exempt from <br /> Title 23, Subchapter 15 requirements per Section 2511(d). The exemption is based <br /> on closure being a required cleanup of pollution resulting from unauthorized <br /> releases to the stormwater pond . Applicable provisions of Subchapter 15 will be <br /> implemented to the extent feasible. The technical issues, of concern to be <br /> addressed are as follows: <br /> 1. Construction and material details of the synthetic membrane cap need to be <br /> supplied. These should include: <br /> a. Design drawings of the cap system including details of foundation and <br /> drainage layers, cap, cover, and runoff controls; <br /> b. Construction procedures including base preparation, installation, and <br /> cover completion; <br /> c. Quality control assurance procedures; <br /> d. Membrane properties including material type, thickness, permeability, <br /> shear and tensile strengths (both material and seams) , puncturing <br /> resistance, thermal expansion/contraction, weatherability, chemical and <br /> biological compatibility, soil burial resistance, and dimensional <br /> stability; and <br /> e. Procedures and chemicals for in place treatment and fixation of sludge <br /> and soils. <br />